Auto updating DNS?

[Jeffrey Ross]

Not totally on topic but I (hope) think its close enough.

The situation is this, I have a DNS server that own and have full 
control of it runs FC6, and it holds the SOA record for my domain.

My home machine is behind a router providing NAT, the router receives 
its address via DHCP, and although its address rarely changes I would 
like my home system to automatically update the record on the 
nameserver.  Currently I use a CNAME
(eg  HOME     3600  IN        CNAME      providersfqdn.provider.com. ) 

Any pointers to updating this automatically?

TIA
Jeff